Tube Harness

Why is my heater not working at its full potential?

I have an 82 bronco and I already replaced the heater core and its like its not blowing hot just warm. Also it will only blow out of the vents and when I move it to the other settings it will still only blow out the vent. Somebody pleases help me.

Okay... I assume you replaced the heater core yourself?
The vent system uses vacuum diaphrams to open/close different ducts to change what vents the air comes out of. It sounds like there is a vacuum line disconnected somewhere behind the dash. If Nothing works, it is probably the main line. Did you forget to plug something back in? Take the harness with all the different colored tubes off the back of the control panel... one of those tubes should have very good suction at idle. If it doesn't, trace the line back to underneath the hood and hopefully you can find a problem there. If it does have suction, make sure nothing happend to the arrangement of the tubes. (Harness connected to control knob properly?)
2nd issues. There is one main flapper door that controls Hot & Cold airflow. A lot of times on older models like you have, the insulation around the flapper door will come apart and not allow the door to make a good seal and this will allow airflow from the cold side to mix with the hot air making it only warm. I have to assume that the flapper door is controlled by a steel cable because of the age. Did you remove that at any point to access the panel? If you removed or loosened it, you may have to re-adjust it.
Remove the cable from the control. Find the door arm lever it is adjusting and move it completely to one side. Pull the cable to correnspond with it and reattach everything. Idealy, you should be able to move the Temp slide all the way to heat and the door should be all the way shut.... you may even feel a little resistance at the end.
However, if the insulation is gone... good luck fixing that.

(also could be thermostat not allowing engine to fully heat up... did you notice your engine running cooler? & check antifreeze level!)

**Bob E.- Did the problem already exist BEFORE you replaced the heater core? The 'only warm air' problem?
Or, did both your problems start after you installed the heater core? Was the old heater core leaking, or did some1 diagnose it as the problem?

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